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ni. Part of a Letter from Mr. Butterfield from 
Paris, Sept. 7. 1698. to Dr. Martin Lifter, 
FelloTP of the Colledge of Phyftcians and K. 6. 
concerning Magnetical Sand. 
I Send you a little of that Black Sand which in Italy they 
ufe inftead of Duft to their Letters ; it is found 
Six Miles from Genes near Sr. Piere d'araine on the Sea- 
Shoar* It hath the Properties of the Loadftone, and I 
do believe that it is Loadftone or Powder of Loadftone, 
for it followerh the Loadftone ; it fticketh to a Knife 
that is touched with the Loadftone ; it draw^eth a Mag- 
netick Needle it doth not ferment with A(iua Fortu^ as 
Iron Duft doth; it doth not ruft wdth any Acide that 
can be put to it it doth not fparkle in the Flame of a 
Candle, as Steel-duft doth when it is thrown into the 
faid Flame. It is commonly found on the Sea-Shoar af- 
ter great Storms. 
IV. An 
